Q: "You need to restart your computer.."

I put the battery back on the MacBook and now the extended test shows no trouble found.

now i am back again with the initial message

"You need to restart the computer."

Re installing theoriginal DVD Mac OS X (by pressing C key) shows the same message.

Thanks for your help.

Back to this subject again. I changed the hard disk and installed windows 7 . Everything does work except the trackball right buttton or the wireless network card.

This is a proof that the hardware is OK.

Of course I prefer to go back to OS X.

Any clue to that ?

no answer ! i am surprised ! just a red exclamation mark in front of the thread.

Have I started a taboo question ?